Ignition coil



H. R. PATTERSON IGNITION COIL Patented Apr. 17,\ A

...UNITED STATES ihafrltla'l*Oli'Fi-clz;

HARRY n. raTTnsON, OF TOLEDO, OHIO, AssirGNoR To THE ELECTRIC AUTO-LITE COMPANY,- Or TOLEDO, OHIO, A CORPORATION OF OHIO.

IGNITION COIL.

To all it may concern:

Be it known that I, HARRY R. PATTERSON, 'p

a Acitizen of the United States,A residing at Toledo, in the county of Lucas and State of Ohio, have invented certain new and useful Improvements in Ignition Coils, of which I declare the following to be a full, clear, land exact description. v This invention relates to induction coils of that typewhich is particularly adapted for use in ignition systems for internal combustion engines.

object of my invention is to provide an improved housing' in which the coil may be mounted and which shall completely enclose the coil protecting it from dirt, water and oil, as well as from physical injury.

A further object is to construct such a housing in part of a paramagnetic material 20. which shall afford-a partial return .path for i the lines `of' force produced by the coil and which shall be o f a form that eddy currents therein are restricted. f

Further objects of' this invention relate to economies of manufacture and I details of construction 'as will hereinafter appear from. the detailed description to follow.w `I accomplish theobjjects of my invention in vcer-` ftain instances by the devices and means vdescribed'in the followingspeciication, vbut it is evident that the .same may bevaried wide;y ly without departingd from'the scope of the invention, as pointe out ink/the ,appended claims. Structures constituting certain embodiments of my invention, any one of which may be the preferred, are illustrated in the accompanying drawings forming a part hereof, in which:

Figure I is an end elevation of an induction coil illustrating my invention.

" Fig. II is a: longitudinal 'vertical sectional view thereof.`

. Fig.- III 'is a transverse sectional view taken midwa .of the coil.

Figs'. IV, and VI are respectively, an end elevation, a longitudinalsectional view* and a transverse sectional viewcorresponding to Figs. I, II and III but illustrating a modification and v Fig, VII is a" circuit diagram'. 50 In the drawings, the same reference numerals'refer to similar partsthroughout the several-fview's,

Referring first to the modification 'shown in Figs.. I, II and III, 'the coil proper com- '.55 prises a Core 5 shown in this instance as con-` structed by rolling up alength of sheet iron, a vprimary winding 6 surrounding the said core and insulated from it'and a secondary winding 7 surrounding and insulated from 60 the .primary winding 6. The coil thus formed is surrounded by suitable insulation and the ends may be enclosed as shown b two heads 8 of suitable insulatin materia An enclosing casing for the coi is formed in part of two end heads 9 of suitable insulating material, one of which is shown provided with lugs 10 associated with terminal posts 11 for facilitating the attachment of terminals 12. Each 4head 9 has a -groove 13 on its 70 inner face and engaging in this groove are the ends of a casing member 14-of magnetic material which, as shown in Fig. III, eX- tends partially around the coil. the gap between its adjacent sides being completed by a plate 15 of non-conducting material.v This member 15 is suitably secured'to the magnetic member 14, as by rivets and also extends in to the grooves `formed in the inner .faces of the vend heads 9. A bolt 17 is shown 80l extending through the core 5 and the two end heads 9 and provided. with'a nut 18' at each end by means of which the two heads maybe clamped against the coil and the casing member 14 and a plate 15. A 85 completely closed, water and oil tight cas y ing is thereby obtained. By constructing the member 14 of the casing of magnetic material as for example sheet steel .the casing is not only rendered firm and rigid but an increased efficiencyy of the coil follows from the fact that a partial return magnetic path r is thereby provided for the core flux, By

this construction, the entire -primary ux interlinks the entire secondary Eddy current flow is effectively prevented by' the gap spanned by the plate 15. Mounted upon the plate 15 is the high tenthe distance between the Washer and :mad-

sionterminal which is connectedv to one end ofthe secondary Winding 6 by 'a wire not shown while the opposite end is grounded on the casing 14. The terminal 2O is shown secured in place by a washer 21 vand jacent edge of the casing 14 may be so constructed that a spark will jump thereover before breaking down. the insulation within the' coil, being in effect a safety sparkigap. The casing member 14 as shown in Fig. III,

is constructed with a. square base portion upon which is. mounted the condenser 23 i .suitably secured in place lby a plate 24 having ears 25 extending through and clinched against the under side .of the base portion. A4 mounting lbracket 2 7 is shown attached to i the `same base portion. Suitable electrical connections are made between the windings,

the condenser and theterminal posts which 'arevwell known and .similar to those of coilsl [in common use and therefore do not require .detailed description herein.

The modication illustrated by Figs. IV, V and VI is similar to that previously described with the exception that the magnetic casing 14 is of cylindrical formY and the end heads 9 are ofcircular form to cor-- winding 7 is shown reversed to that of the form previously described. Although the ,two `windings function ,in substantially the same manner in either arrangement, in certain cases, as'for example where a higher lresistance-primary is desirable or where it is necessary to provide for a more rapid disi sipation o; heat from the primary winding, this winding may be wound outside of ,in-v

stead of within the secondary winding.

In the circuit diagram forming Fig. VII, the induction lcoil is shownz by way of example only, as having its primary connected in a vsystem lincluding athirdbrush 'gen-e erator 30, an-interrupter'l, a storage 'battery 32. and a lightingcircuit 83. In such f asystem the coil is adapted to supply the ignition. spark foran internal combustion engine driving the generator.- l While I have described inyinvention in 'more or less detail, and as being embodied in certain precise forms I do not desire or intend to be limited' thereto, as on the contrary my invention contemplates broadlyall V- proper changes, as -well as the omission of immaterial elements and the substitution of equivalents therefore, as -circumstances may suggest or necessity renderV expedient.

Having thus describedlmy invention, what I claim as newv and desire to secure by'Letters Patent, is: `1. In a device-of the class described the and a secondary winding wound thereon, a

V:combination of 'a core, a primary winding casing for said core and windings, comprising a member of magnetic material extend.`

ing approximately around the same, a member of non-conducting material joining the adjacent ends ofsaid casing and a high tension terminal carried by ing member.

2. In'a device of the class described, the

combination with a core, a primary wind-Q in and a secondary winding surrounding said core of an end head at each end'of said core, an intermediate member of mag- 7.a said non-conductnetic material nearly surrounding said cofre and winding and whose opposite ends en gage said end heads, amember of non-conducting material extending between the said heads'and closing the space between the adjacent sides of said intermediate member, and a terminall for the secondary winding mounted on said non-conducting member.

3.- In a device' of the class described, the combination with an induction coil comprising a core having primary and secondwindingsinductively related thereto, of.

a arliousing for saidcoil comprisinga pair of spaced end heads and an intermediate surrounding portion engaging said heads formed in part of a member of magnetic material and in-part of a member of nonconducting material whose ends are secured to the ends 4of said magnetic member and means'for securing said induction coil within saidhousing.

4. In a device of theclass described, the combination of a core, primary and secondary windin thereon, an end head adjacent each end o' said core, a sheet steel member engaging said `heads and bent to extend about saidcore and windings, a plate of insulating material secured to the adjacent edges of said vmemberv and also engaging` said heads and a high tension terminal carried by said plate and spaced from said edges. l

5. In a devicevof the class described, the

vcombination of a core having primary and secondary windings thereon, means for housing said core and windings and `for partially completing the ma etic circuit of said windings, said-means aving a gap extending longitudinally of said core and' non-conductingmeans for bridging said-ga and supgting a terminal of said secon ary win g.

6.- I n a device of the class described, the 'combination of la core, primary and secondary windings thereon, an end head adj acent l each end of said core, a sheet steel member engaging Asaid heads and bent to partially surround saidocore and windings, a plate of insulating material secured to the adjacent edges of said member to thereby 5 completely enclose Said coil und windings, a hgh tension terminal secured to said plate and Connected with said secondary winding, a condenser mounted on'the inner member and said plate.

In testlmony whereof, I afx my srgnature.

HARRY R. PATTERSON. 

